78201644 has 12 divisors (see below), whose sum is σ = 144055800. Its totient is φ = 37042848.

The previous prime is 78201619. The next prime is 78201707. The reversal of 78201644 is 44610287.

It is a super-2 number, since 2×78201644² = 12230994248605472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78201644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514409 + ... + 514560.

It is an arithmetic number, because the mean of its divisors is an integer number (12004650).

Almost surely, 2^78201644 is an apocalyptic number.

It is an amenable number.

78201644 is a deficient number, since it is larger than the sum of its proper divisors (65854156).

78201644 is a wasteful number, since it uses less digits than its factorization.

78201644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028992 (or 1028990 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 78201644 is about 8843.1693413617. The cubic root of 78201644 is about 427.6337376681.

The spelling of 78201644 in words is "seventy-eight million, two hundred one thousand, six hundred forty-four".